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682
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WATER YEAR : 2013
TAPI RIVER BASIN
Tapi River at Ban Khian Sa , Surat Thani (X.217)
Lat 08 - 50 - 54 N Long 99 - 12 - 03 E
Locat on : on e t an at Ban K an Sa.
6,697
sq.km.
Water - stage recorder
+0.000 m. (MSL.)
B.M.-H.D.
On left bank at the abutment of the bridge.
Elevation
Recording.
Drainge Area
Amphoe
Khian Sa
Changwat
Surat Thani
Ban
Khian Sa
Gage Reading Frequency
Zero Gage at Bottom
+9.801 m. (MSL.)
Type of Gage
Bench Mark
Location BM
Arithmetic mean of 24 readings
2003 to date
2003 to date
-
2003 to date
Fairly stable because of backwater effect.
No overbank flow.
Rated by Current Meter
Stability of Channel Regimes
Overbank Flow Conditions
Rating Operation
Period of Rating
Rated by Flot
Period of Available Gage Records
Basis of Mean Daily Gage Height
Records fair. Stage-discharge relation defined by 20 discharge measurements made in 2013.
Date
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Annual
----------
-----------------
1
0.41
0.73
0.42
0.85
0.77
1.02
1.33
3.02
4.12
1.18
0.50
0.23
2
0.38
0.69
0.41
0.77
1.23
1.11
1.51
2.96
4.14
1.15
0.40
0.27
3
0.38
0.68
0.36
0.75
1.58
1.39
1.51
2.87
4.06
1.10
0.35
0.33
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Gage Height in Meter (MSL.) Water Year April 1, 2013 to March 31, 2014
General Description
4
0.34
0.63
0.40
0.85
1.79
1.52
1.48
2.76
3.99
0.97
0.36
0.28
5
0.30
0.48
0.43
1.11
1.89
1.62
1.49
2.65
3.91
0.95
0.44
0.33
6
0.22
0.48
0.45
1.34
1.91
1.74
1.59
2.51
3.83
1.03
0.43
0.45
7
0.11
0.54
0.43
1.50
1.93
1.85
1.69
2.34
3.78
0.88
0.32
0.50
8
0.24
0.62
0.46
1.55
1.96
1.97
1.77
2.12
3.68
0.69
0.30
0.25
9
0.37
0.70
0.39
1.60
1.99
2.06
1.84
1.92
3.62
0.72
0.27
0.30
10
0.37
0.73
0.32
1.62
2.00
2.13
1.91
1.73
3.57
0.86
0.36
0.35
11
0.38
0.82
0.35
1.60
2.04
2.16
1.98
1.53
3.52
0.80
0.35
0.37
12
0 46
0 85
0 43
1 53
2 04
2 18
2 02
1 57
3 52
0 68
0 47
0 35
.
.
.
.
.
.
.
.
.
.
.
.
13
0.54
0.73
0.76
1.41
2.03
2.20
2.04
1.68
3.50
0.78
0.60
0.37
14
0.43
0.63
1.33
1.27
2.04
2.19
2.04
1.75
3.48
0.93
0.48
0.25
15
0.41
0.59
1.57
1.18
2.05
2.17
2.02
1.82
3.39
0.95
0.62
0.23
16
0.45
0.48
1.72
1.18
2.07
2.15
1.99
1.87
3.32
0.95
0.65
0.58
17
0.43
0.42
1.85
1.24
2.07
2.12
1.98
1.92
3.19
0.82
0.46
0.58
18
0.32
0.32
1.94
1.26
2.06
2.07
2.08
1.93
3.07
0.81
0.44
0.44
19
0.37
0.40
2.00
1.31
1.99
2.00
2.14
1.91
2.95
0.93
0.41
0.47
20
0.42
0.43
2.06
1.28
1.87
1.88
2.20
1.94
2.81
0.81
0.48
0.55
21
0.32
0.23
2.12
1.23
1.66
1.78
2.26
1.96
2.67
0.67
0.70
0.54
22
0.31
0.25
2.21
1.11
1.42
1.78
2.31
2.04
2.51
0.79
0.42
0.67
23
0.37
0.38
2.28
1.16
1.18
1.81
2.38
2.23
2.33
0.80
0.37
0.53
24
0.34
0.41
2.30
1.31
1.00
1.86
2.45
2.44
2.16
0.63
0.41
0.44
25
0.36
0.43
2.24
1.39
0.94
1.87
2.52
2.67
1.91
0.50
0.39
0.37
26
0.42
0.51
2.08
1.37
0.92
1.80
2.60
2.88
1.68
0.48
0.36
0.45
27
0.52
0.79
1.82
1.32
0.87
1.66
2.66
3.02
1.44
0.51
0.42
0.28
28
0.55
0.87
1.49
1.21
0.81
1.45
2.75
3.22
1.39
0.65
0.45
0.54
29
0.67
0.73
1.22
1.01
0.79
1.23
2.87
3.60
1.23
0.64
0.21
30
0.71
0.64
1.00
0.80
0.84
1.22
2.98
3.95
1.09
0.60
0.35
31
0.57
0.70
0.97
3.03
1.15
0.59
0.24
----------
--------------
Mean
0.40
0.57
1.23
1.22
1.57
1.80
2.11
2.36
2.94
0.80
0.44
0.39
Max
0.71
0.87
2.30
1.62
2.07
2.20
3.03
3.95
4.14
1.18
0.70
0.67
4.14
Min
0.11
0.23
0.32
0.70
0.77
1.02
1.33
1.53
1.09
0.48
0.27
0.21
0.11
4.15
m. (MSL.) ,
0.00
m. (MSL.) ,
River Bed -7.00
m. (MSL.)
9.94
m. (MSL.) ,
8.65
m. (MSL.) ,
Drainage Area 6697 Square Kilometers
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at 07.00 Hours , on Dec 2 , 2013
Annual Max Momentary Gage Height
Zero Gage at Bottom Elevation
Right Bank Elevation
Left Bank Elevation